<!--  -->
<script setup>
import { useMouseInElement } from "@vueuse/core";
import { reactive, ref, watch } from "vue";

defineProps({
  images: {
    type: Array,
    default: [],
  },
});
// 是否显示遮罩
const show = ref(false);
// 遮罩的坐标
const layerPosition = reactive({
  left: 0,
  top: 0,
});
// 大图背景定位(样式)
const largePosition = reactive({
  backgroundPositionX: "-100px",
  backgroundPositionY: 0,
});

const target = ref(null);

const { elementX, elementY, isOutside } = useMouseInElement(target);

watch([elementX, elementY, isOutside], () => {
  const position = { x: 0, y: 0 };
  if (elementX.value < 100) position.left = 0;
  else if (elementX.value > 300) position.left = 200;
  else position.left = elementX.value - 100;
  // 控制Y轴方向的定位 0-200 之间
  if (elementY.value < 100) position.top = 0;
  else if (elementY.value > 300) position.top = 200;
  else position.top = elementY.value - 100;
  // 设置大背景的定位
  largePosition.backgroundPositionX = -position.left * 2 + "px";
  largePosition.backgroundPositionY = -position.top * 2 + "px";
  // 设置遮罩容器的定位
  layerPosition.left = position.left + "px";
  layerPosition.top = position.top + "px";
  // 设置是否显示预览大图
  show.value = !isOutside.value;
});

const currIndex = ref(0);
</script>

<template>
  <div class="goods-image">
    <div
      v-show="show"
      class="large"
      :style="[{ backgroundImage: `url(${images[currIndex]})` }, largePosition]"
    ></div>
    <div class="middle" ref="target">
      <img
        :src="images[currIndex]"
        alt
        @mousemove="show = true"
        @mouseout="show = false"
      />
      <div v-show="show" class="layer" :style="layerPosition"></div>
    </div>
    <ul class="small">
      <li
        v-for="(img, i) in images"
        :key="img"
        :class="{ active: i === currIndex }"
      >
        <img @mouseenter="currIndex = i" :src="img" alt />
      </li>
    </ul>
  </div>
</template>

<style lang='less' scoped>
.goods-image {
  width: 480px;
  height: 400px;
  position: relative;
  display: flex;
  z-index: 500;
  .large {
    position: absolute;
    top: 0;
    left: 412px;
    width: 400px;
    height: 400px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    background-repeat: no-repeat;
    background-size: 800px 800px;
    background-color: #f8f8f8;
  }
  .middle {
    width: 400px;
    height: 400px;
    background: #f5f5f5;
    position: relative;
    cursor: move;
    .layer {
      width: 200px;
      height: 200px;
      background: rgba(0, 0, 0, 0.2);
      left: 0;
      top: 0;
      position: absolute;
    }
    img {
      width: 400px;
      height: 400px;
    }
  }
  .small {
    width: 80px;

    li {
      width: 69px;
      height: 69px;
      margin-left: 12px;
      margin-bottom: 14px;
      cursor: pointer;
      text-align: center;
      img {
        width: 65px;
        height: 65px;
        object-fit: cover;
      }
      &:hover,
      &.active {
        border: 2px solid @xtxColor;
      }
    }
  }
}
</style>